Sensing Mechanism and Application for Recognition of Ethanol by Calixarene Supramolecules Based on Hydrogen Bonds Interaction

doi:10.7503/cjcu20130110

Abstract

Abstract:

Four calixarenederivatives were employed as adsorptive coating materials of quartz crystal microbalance(QCM) for the detection of ethanol gas in environmental atmosphere, indicating that C-ethylcalix[4]pirogallarene(3) was the most effectively active material to ethanol. The single crystal of complex C-ethylcalix[4]pirogallarene·2CH₃CH₂OH(5) was prepared and subjected to X-ray diffraction analysis, showing that the recognition mechanism was based on the formation of C-H…π, O-H…π and O-H…O hydrogen bonds interaction between the supramolecular host calixarene 3 and the guest ethanol molecule. When the coating mass of calixarene 3 was 24.70 μg, the coated QCM sensor possessed the highest sensitivity, which was 10.53 Hz/(mg·L^-1). The kinetics processes for adsorption and desorption of ethanol on calixarene 3 have been examined, and the initial speeds of the adsorption and desorption processes for ethanol gas on cali-xarene 3 were obtained as -0.04600 Hz/s and 0.03896 Hz/s, respectively. With rapid test time, good selectivity, reversibility, reproducibility and stability, the calixarene 3 coated QCM sensor could be used for the detection of ethanol samples with a recovery of 94.8%-105.2%, which was in well consistent with those obtained by gas chromatography, showing its potential application on the determination of ethanol gas in living environment.

Key words: C-Ethylcalix[4]pirogallarene, Ethanol, Supramolecular recognition, Hydrogen bond interaction

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ZHOU Ting, CAO Zhong, DAI Yun-Lin, CAO Ting-Ting, HE Jing-Lin, XU Lei-Tao, LONG Shu. Sensing Mechanism and Application for Recognition of Ethanol by Calixarene Supramolecules Based on Hydrogen Bonds Interaction[J]. Chem. J. Chinese Universities, 2013, 34(6): 1339.

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Sensing Mechanism and Application for Recognition of Ethanol by Calixarene Supramolecules Based on Hydrogen Bonds Interaction

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